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main.lisp
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;;;; the top level interfaces to the compiler, plus some other
;;;; compiler-related stuff (e.g. CL:CALL-ARGUMENTS-LIMIT) which
;;;; doesn't obviously belong anywhere else
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
;;;;
;;;; This software is derived from the CMU CL system, which was
;;;; written at Carnegie Mellon University and released into the
;;;; public domain. The software is in the public domain and is
;;;; provided with absolutely no warranty. See the COPYING and CREDITS
;;;; files for more information.
(in-package "SB!C")
;;; FIXME: Doesn't this belong somewhere else, like early-c.lisp?
(declaim (special *constants* *free-vars* *component-being-compiled*
*code-vector* *next-location* *result-fixups*
*free-funs* *source-paths*
*continuation-number* *continuation-numbers*
*number-continuations* *tn-id* *tn-ids* *id-tns*
*label-ids* *label-id* *id-labels*
*undefined-warnings* *compiler-error-count*
*compiler-warning-count* *compiler-style-warning-count*
*compiler-note-count*
*compiler-error-bailout*
#!+sb-show *compiler-trace-output*
*last-source-context* *last-original-source*
*last-source-form* *last-format-string* *last-format-args*
*last-message-count* *last-error-context*
*lexenv* *fun-names-in-this-file*
*allow-instrumenting*))
;;; Whether reference to a thing which cannot be defined causes a full
;;; warning.
(defvar *flame-on-necessarily-undefined-thing* nil)
(defvar *check-consistency* nil)
;;; Set to NIL to disable loop analysis for register allocation.
(defvar *loop-analyze* t)
;;; Bind this to a stream to capture various internal debugging output.
(defvar *compiler-trace-output* nil)
;;; The current block compilation state. These are initialized to the
;;; :BLOCK-COMPILE and :ENTRY-POINTS arguments that COMPILE-FILE was
;;; called with.
;;;
;;; *BLOCK-COMPILE-ARG* holds the original value of the :BLOCK-COMPILE
;;; argument, which overrides any internal declarations.
(defvar *block-compile*)
(defvar *block-compile-arg*)
(declaim (type (member nil t :specified) *block-compile* *block-compile-arg*))
(defvar *entry-points*)
(declaim (list *entry-points*))
;;; When block compiling, used by PROCESS-FORM to accumulate top level
;;; lambdas resulting from compiling subforms. (In reverse order.)
(defvar *toplevel-lambdas*)
(declaim (list *toplevel-lambdas*))
;;; The current non-macroexpanded toplevel form as printed when
;;; *compile-print* is true.
(defvar *top-level-form-noted* nil)
(defvar sb!xc:*compile-verbose* t
#!+sb-doc
"The default for the :VERBOSE argument to COMPILE-FILE.")
(defvar sb!xc:*compile-print* t
#!+sb-doc
"The default for the :PRINT argument to COMPILE-FILE.")
(defvar *compile-progress* nil
#!+sb-doc
"When this is true, the compiler prints to *STANDARD-OUTPUT* progress
information about the phases of compilation of each function. (This
is useful mainly in large block compilations.)")
(defvar sb!xc:*compile-file-pathname* nil
#!+sb-doc
"The defaulted pathname of the file currently being compiled, or NIL if not
compiling.")
(defvar sb!xc:*compile-file-truename* nil
#!+sb-doc
"The TRUENAME of the file currently being compiled, or NIL if not
compiling.")
(declaim (type (or pathname null)
sb!xc:*compile-file-pathname*
sb!xc:*compile-file-truename*))
;;; the SOURCE-INFO structure for the current compilation. This is
;;; null globally to indicate that we aren't currently in any
;;; identifiable compilation.
(defvar *source-info* nil)
;;; This is true if we are within a WITH-COMPILATION-UNIT form (which
;;; normally causes nested uses to be no-ops).
(defvar *in-compilation-unit* nil)
;;; Count of the number of compilation units dynamically enclosed by
;;; the current active WITH-COMPILATION-UNIT that were unwound out of.
(defvar *aborted-compilation-unit-count*)
;;; Mumble conditional on *COMPILE-PROGRESS*.
(defun maybe-mumble (&rest foo)
(when *compile-progress*
(compiler-mumble "~&")
(pprint-logical-block (*standard-output* nil :per-line-prefix "; ")
(apply #'compiler-mumble foo))))
(deftype object () '(or fasl-output core-object null))
(defvar *compile-object* nil)
(declaim (type object *compile-object*))
(defvar *compile-toplevel-object* nil)
(defvar *emit-cfasl* nil)
(defvar *fopcompile-label-counter*)
;; Used during compilation to map code paths to the matching
;; instrumentation conses.
(defvar *code-coverage-records* nil)
;; Used during compilation to keep track of with source paths have been
;; instrumented in which blocks.
(defvar *code-coverage-blocks* nil)
;; Stores the code coverage instrumentation results. Keys are namestrings,
;; the value is a list of (CONS PATH STATE), where STATE is NIL for
;; a path that has not been visited, and T for one that has.
(defvar *code-coverage-info* (make-hash-table :test 'equal))
;;;; WITH-COMPILATION-UNIT and WITH-COMPILATION-VALUES
(defmacro sb!xc:with-compilation-unit (options &body body)
#!+sb-doc
"Affects compilations that take place within its dynamic extent. It is
intended to be eg. wrapped around the compilation of all files in the same system.
Following options are defined:
:OVERRIDE Boolean-Form
One of the effects of this form is to delay undefined warnings until the
end of the form, instead of giving them at the end of each compilation.
If OVERRIDE is NIL (the default), then the outermost
WITH-COMPILATION-UNIT form grabs the undefined warnings. Specifying
OVERRIDE true causes that form to grab any enclosed warnings, even if it
is enclosed by another WITH-COMPILATION-UNIT.
:POLICY Optimize-Declaration-Form
Provides dynamic scoping for global compiler optimization qualities and
restrictions, limiting effects of subsequent OPTIMIZE proclamations and
calls to SB-EXT:RESTRICT-COMPILER-POLICY to the dynamic scope of BODY.
If OVERRIDE is false, specified POLICY is merged with current global
policy. If OVERRIDE is true, current global policy, including any
restrictions, is discarded in favor of the specified POLICY.
Supplying POLICY NIL is equivalent to the option not being supplied at
all, ie. dynamic scoping of policy does not take place.
This option is an SBCL-specific experimental extension: Interface
subject to change.
:SOURCE-NAMESTRING Namestring-Form
Attaches the value returned by the Namestring-Form to the internal
debug-source information as the namestring of the source file. Normally
the namestring of the input-file for COMPILE-FILE is used: this option
can be used to provide source-file information for functions compiled
using COMPILE, or to override the input-file of COMPILE-FILE.
If both an outer and an inner WITH-COMPILATION-UNIT provide a
SOURCE-NAMESTRING, the inner one takes precedence. Unaffected
by :OVERRIDE.
This is an SBCL-specific extension.
:SOURCE-PLIST Plist-Form
Attaches the value returned by the Plist-Form to internal debug-source
information of functions compiled in within the dynamic extent of BODY.
Primarily for use by development environments, in order to eg. associate
function definitions with editor-buffers. Can be accessed using
SB-INTROSPECT:DEFINITION-SOURCE-PLIST.
If an outer WITH-COMPILATION-UNIT form also provide a SOURCE-PLIST, it
is appended to the end of the provided SOURCE-PLIST. Unaffected
by :OVERRIDE.
This is an SBCL-specific extension.
Examples:
;; Prevent proclamations from the file leaking, and restrict
;; SAFETY to 3 -- otherwise uses the current global policy.
(with-compilation-unit (:policy '(optimize))
(restrict-compiler-policy 'safety 3)
(load \"foo.lisp\"))
;; Using default policy instead of the current global one,
;; except for DEBUG 3.
(with-compilation-unit (:policy '(optimize debug)
:override t)
(load \"foo.lisp\"))
;; Same as if :POLICY had not been specified at all: SAFETY 3
;; proclamation leaks out from WITH-COMPILATION-UNIT.
(with-compilation-unit (:policy nil)
(declaim (optimize safety))
(load \"foo.lisp\"))
"
`(%with-compilation-unit (lambda () ,@body) ,@options))
(defvar *source-plist* nil)
(defvar *source-namestring* nil)
(defun %with-compilation-unit (fn &key override policy source-plist source-namestring)
(declare (type function fn))
(flet ((with-it ()
(let ((succeeded-p nil)
(*source-plist* (append source-plist *source-plist*))
(*source-namestring* (or source-namestring *source-namestring*)))
(if (and *in-compilation-unit* (not override))
;; Inside another WITH-COMPILATION-UNIT, a WITH-COMPILATION-UNIT is
;; ordinarily (unless OVERRIDE) basically a no-op.
(unwind-protect
(multiple-value-prog1 (funcall fn) (setf succeeded-p t))
(unless succeeded-p
(incf *aborted-compilation-unit-count*)))
(let ((*aborted-compilation-unit-count* 0)
(*compiler-error-count* 0)
(*compiler-warning-count* 0)
(*compiler-style-warning-count* 0)
(*compiler-note-count* 0)
(*undefined-warnings* nil)
(*in-compilation-unit* t))
(handler-bind ((parse-unknown-type
(lambda (c)
(note-undefined-reference
(parse-unknown-type-specifier c)
:type))))
(unwind-protect
(multiple-value-prog1 (funcall fn) (setf succeeded-p t))
(unless succeeded-p
(incf *aborted-compilation-unit-count*))
(summarize-compilation-unit (not succeeded-p)))))))))
(if policy
(let ((*policy* (process-optimize-decl policy (unless override *policy*)))
(*policy-restrictions* (unless override *policy-restrictions*)))
(with-it))
(with-it))))
;;; Is NAME something that no conforming program can rely on
;;; defining?
(defun name-reserved-by-ansi-p (name kind)
(ecase kind
(:function
(eq (symbol-package (fun-name-block-name name))
*cl-package*))
(:type
(let ((symbol (typecase name
(symbol name)
((cons symbol) (car name))
(t (return-from name-reserved-by-ansi-p nil)))))
(eq (symbol-package symbol) *cl-package*)))))
;;; This is to be called at the end of a compilation unit. It signals
;;; any residual warnings about unknown stuff, then prints the total
;;; error counts. ABORT-P should be true when the compilation unit was
;;; aborted by throwing out. ABORT-COUNT is the number of dynamically
;;; enclosed nested compilation units that were aborted.
(defun summarize-compilation-unit (abort-p)
(let (summary)
(unless abort-p
(handler-bind ((style-warning #'compiler-style-warning-handler)
(warning #'compiler-warning-handler))
(let ((undefs (sort *undefined-warnings* #'string<
:key (lambda (x)
(let ((x (undefined-warning-name x)))
(if (symbolp x)
(symbol-name x)
(prin1-to-string x)))))))
(dolist (kind '(:variable :function :type))
(let ((names (mapcar #'undefined-warning-name
(remove kind undefs :test #'neq
:key #'undefined-warning-kind))))
(when names (push (cons kind names) summary))))
(dolist (undef undefs)
(let ((name (undefined-warning-name undef))
(kind (undefined-warning-kind undef))
(warnings (undefined-warning-warnings undef))
(undefined-warning-count (undefined-warning-count undef)))
(dolist (*compiler-error-context* warnings)
(if #-sb-xc-host (and (member kind '(:function :type))
(name-reserved-by-ansi-p name kind)
*flame-on-necessarily-undefined-thing*)
#+sb-xc-host nil
(ecase kind
(:function
(case name
((declare)
(compiler-warn
"~@<There is no function named ~S. References to ~S ~
in some contexts (like starts of blocks) have ~
special meaning, but here it would have to be a ~
function, and that shouldn't be right.~:@>" name
name))
(t
(compiler-warn
"~@<The function ~S is undefined, and its name is ~
reserved by ANSI CL so that even if it were ~
defined later, the code doing so would not be ~
portable.~:@>" name))))
(:type
(if (and (consp name) (eq 'quote (car name)))
(compiler-warn
"~@<Undefined type ~S. The name starts with ~S: ~
probably use of a quoted type name in a context ~
where the name is not evaluated.~:@>"
name 'quote)
(compiler-warn
"~@<Undefined type ~S. Note that name ~S is ~
reserved by ANSI CL, so code defining a type with ~
that name would not be portable.~:@>" name
name))))
(if (eq kind :variable)
(compiler-warn "undefined ~(~A~): ~S" kind name)
(compiler-style-warn "undefined ~(~A~): ~S" kind name))))
(let ((warn-count (length warnings)))
(when (and warnings (> undefined-warning-count warn-count))
(let ((more (- undefined-warning-count warn-count)))
(if (eq kind :variable)
(compiler-warn
"~W more use~:P of undefined ~(~A~) ~S"
more kind name)
(compiler-style-warn
"~W more use~:P of undefined ~(~A~) ~S"
more kind name))))))))))
(unless (and (not abort-p)
(zerop *aborted-compilation-unit-count*)
(zerop *compiler-error-count*)
(zerop *compiler-warning-count*)
(zerop *compiler-style-warning-count*)
(zerop *compiler-note-count*))
(pprint-logical-block (*error-output* nil :per-line-prefix "; ")
(format *error-output* "~&compilation unit ~:[finished~;aborted~]"
abort-p)
(dolist (cell summary)
(destructuring-bind (kind &rest names) cell
(format *error-output*
"~& Undefined ~(~A~)~p:~
~% ~{~<~% ~1:;~S~>~^ ~}"
kind (length names) names)))
(format *error-output* "~[~:;~:*~& caught ~W fatal ERROR condition~:P~]~
~[~:;~:*~& caught ~W ERROR condition~:P~]~
~[~:;~:*~& caught ~W WARNING condition~:P~]~
~[~:;~:*~& caught ~W STYLE-WARNING condition~:P~]~
~[~:;~:*~& printed ~W note~:P~]"
*aborted-compilation-unit-count*
*compiler-error-count*
*compiler-warning-count*
*compiler-style-warning-count*
*compiler-note-count*))
(terpri *error-output*)
(force-output *error-output*))))
;;; Evaluate BODY, then return (VALUES BODY-VALUE WARNINGS-P
;;; FAILURE-P), where BODY-VALUE is the first value of the body, and
;;; WARNINGS-P and FAILURE-P are as in CL:COMPILE or CL:COMPILE-FILE.
;;; This also wraps up WITH-IR1-NAMESPACE functionality.
(defmacro with-compilation-values (&body body)
;; These bindings could just as well be in WITH-IR1-NAMESPACE, but
;; since they're primarily debugging tools, it's nicer to have
;; a wider unique scope by ID.
`(let ((*continuation-number* 0)
(*continuation-numbers* (make-hash-table :test 'eq))
(*number-continuations* (make-hash-table :test 'eql))
(*tn-id* 0)
(*tn-ids* (make-hash-table :test 'eq))
(*id-tns* (make-hash-table :test 'eql))
(*label-id* 0)
(*label-ids* (make-hash-table :test 'eq))
(*id-labels* (make-hash-table :test 'eql)))
(unwind-protect
(let ((*warnings-p* nil)
(*failure-p* nil))
(handler-bind ((compiler-error #'compiler-error-handler)
(style-warning #'compiler-style-warning-handler)
(warning #'compiler-warning-handler))
(values (progn ,@body)
*warnings-p*
*failure-p*)))
(clrhash *tn-ids*)
(clrhash *id-tns*)
(clrhash *continuation-numbers*)
(clrhash *number-continuations*)
(clrhash *label-ids*)
(clrhash *id-labels*))))
;;;; component compilation
(defparameter *max-optimize-iterations* 3 ; ARB
#!+sb-doc
"The upper limit on the number of times that we will consecutively do IR1
optimization that doesn't introduce any new code. A finite limit is
necessary, since type inference may take arbitrarily long to converge.")
(defevent ir1-optimize-until-done "IR1-OPTIMIZE-UNTIL-DONE called")
(defevent ir1-optimize-maxed-out "hit *MAX-OPTIMIZE-ITERATIONS* limit")
;;; Repeatedly optimize COMPONENT until no further optimizations can
;;; be found or we hit our iteration limit. When we hit the limit, we
;;; clear the component and block REOPTIMIZE flags to discourage the
;;; next optimization attempt from pounding on the same code.
(defun ir1-optimize-until-done (component)
(declare (type component component))
(maybe-mumble "opt")
(event ir1-optimize-until-done)
(let ((count 0)
(cleared-reanalyze nil)
(fastp nil))
(loop
(when (component-reanalyze component)
(setq count 0)
(setq cleared-reanalyze t)
(setf (component-reanalyze component) nil))
(setf (component-reoptimize component) nil)
(ir1-optimize component fastp)
(cond ((component-reoptimize component)
(incf count)
(when (and (>= count *max-optimize-iterations*)
(not (component-reanalyze component))
(eq (component-reoptimize component) :maybe))
(maybe-mumble "*")
(cond ((retry-delayed-ir1-transforms :optimize)
(maybe-mumble "+")
(setq count 0))
(t
(event ir1-optimize-maxed-out)
(setf (component-reoptimize component) nil)
(do-blocks (block component)
(setf (block-reoptimize block) nil))
(return)))))
((retry-delayed-ir1-transforms :optimize)
(setf count 0)
(maybe-mumble "+"))
(t
(maybe-mumble " ")
(return)))
(setq fastp (>= count *max-optimize-iterations*))
(maybe-mumble (if fastp "-" ".")))
(when cleared-reanalyze
(setf (component-reanalyze component) t)))
(values))
(defparameter *constraint-propagate* t)
;;; KLUDGE: This was bumped from 5 to 10 in a DTC patch ported by MNA
;;; from CMU CL into sbcl-0.6.11.44, the same one which allowed IR1
;;; transforms to be delayed. Either DTC or MNA or both didn't explain
;;; why, and I don't know what the rationale was. -- WHN 2001-04-28
;;;
;;; FIXME: It would be good to document why it's important to have a
;;; large value here, and what the drawbacks of an excessively large
;;; value are; and it might also be good to make it depend on
;;; optimization policy.
(defparameter *reoptimize-after-type-check-max* 10)
(defevent reoptimize-maxed-out
"*REOPTIMIZE-AFTER-TYPE-CHECK-MAX* exceeded.")
;;; Iterate doing FIND-DFO until no new dead code is discovered.
(defun dfo-as-needed (component)
(declare (type component component))
(when (component-reanalyze component)
(maybe-mumble "DFO")
(loop
(find-dfo component)
(unless (component-reanalyze component)
(maybe-mumble " ")
(return))
(maybe-mumble ".")))
(values))
;;; Do all the IR1 phases for a non-top-level component.
(defun ir1-phases (component)
(declare (type component component))
(aver-live-component component)
(let ((*constraint-universe* (make-array 64 ; arbitrary, but don't
;make this 0.
:fill-pointer 0 :adjustable t))
(loop-count 1)
(*delayed-ir1-transforms* nil))
(declare (special *constraint-universe* *delayed-ir1-transforms*))
(loop
(ir1-optimize-until-done component)
(when (or (component-new-functionals component)
(component-reanalyze-functionals component))
(maybe-mumble "locall ")
(locall-analyze-component component))
(dfo-as-needed component)
(when *constraint-propagate*
(maybe-mumble "constraint ")
(constraint-propagate component))
(when (retry-delayed-ir1-transforms :constraint)
(maybe-mumble "Rtran "))
(flet ((want-reoptimization-p ()
(or (component-reoptimize component)
(component-reanalyze component)
(component-new-functionals component)
(component-reanalyze-functionals component))))
(unless (and (want-reoptimization-p)
;; We delay the generation of type checks until
;; the type constraints have had time to
;; propagate, else the compiler can confuse itself.
(< loop-count (- *reoptimize-after-type-check-max* 4)))
(maybe-mumble "type ")
(generate-type-checks component)
(unless (want-reoptimization-p)
(return))))
(when (>= loop-count *reoptimize-after-type-check-max*)
(maybe-mumble "[reoptimize limit]")
(event reoptimize-maxed-out)
(return))
(incf loop-count)))
(ir1-finalize component)
(values))
(defun %compile-component (component)
(let ((*code-segment* nil)
(*elsewhere* nil)
#!+inline-constants
(*constant-segment* nil)
#!+inline-constants
(*constant-table* nil)
#!+inline-constants
(*constant-vector* nil))
(maybe-mumble "GTN ")
(gtn-analyze component)
(maybe-mumble "LTN ")
(ltn-analyze component)
(dfo-as-needed component)
(maybe-mumble "control ")
(control-analyze component #'make-ir2-block)
(when (or (ir2-component-values-receivers (component-info component))
(component-dx-lvars component))
(maybe-mumble "stack ")
(stack-analyze component)
;; Assign BLOCK-NUMBER for any cleanup blocks introduced by
;; stack analysis. There shouldn't be any unreachable code after
;; control, so this won't delete anything.
(dfo-as-needed component))
(unwind-protect
(progn
(maybe-mumble "IR2tran ")
(init-assembler)
(entry-analyze component)
(ir2-convert component)
(when (policy *lexenv* (>= speed compilation-speed))
(maybe-mumble "copy ")
(copy-propagate component))
(ir2-optimize component)
(select-representations component)
(when *check-consistency*
(maybe-mumble "check2 ")
(check-ir2-consistency component))
(delete-unreferenced-tns component)
(maybe-mumble "life ")
(lifetime-analyze component)
(when *compile-progress*
(compiler-mumble "") ; Sync before doing more output.
(pre-pack-tn-stats component *standard-output*))
(when *check-consistency*
(maybe-mumble "check-life ")
(check-life-consistency component))
(maybe-mumble "pack ")
(pack component)
(when *check-consistency*
(maybe-mumble "check-pack ")
(check-pack-consistency component))
(when *compiler-trace-output*
(describe-component component *compiler-trace-output*)
(describe-ir2-component component *compiler-trace-output*))
(maybe-mumble "code ")
(multiple-value-bind (code-length trace-table fixup-notes)
(generate-code component)
#-sb-xc-host
(when *compiler-trace-output*
(format *compiler-trace-output*
"~|~%disassembly of code for ~S~2%" component)
(sb!disassem:disassemble-assem-segment *code-segment*
*compiler-trace-output*))
(etypecase *compile-object*
(fasl-output
(maybe-mumble "fasl")
(fasl-dump-component component
*code-segment*
code-length
trace-table
fixup-notes
*compile-object*))
(core-object
(maybe-mumble "core")
(make-core-component component
*code-segment*
code-length
trace-table
fixup-notes
*compile-object*))
(null))))))
;; We're done, so don't bother keeping anything around.
(setf (component-info component) :dead)
(values))
;;; Delete components with no external entry points before we try to
;;; generate code. Unreachable closures can cause IR2 conversion to
;;; puke on itself, since it is the reference to the closure which
;;; normally causes the components to be combined.
(defun delete-if-no-entries (component)
(dolist (fun (component-lambdas component) (delete-component component))
(when (functional-has-external-references-p fun)
(return))
(case (functional-kind fun)
(:toplevel (return))
(:external
(unless (every (lambda (ref)
(eq (node-component ref) component))
(leaf-refs fun))
(return))))))
(defun compile-component (component)
;; miscellaneous sanity checks
;;
;; FIXME: These are basically pretty wimpy compared to the checks done
;; by the old CHECK-IR1-CONSISTENCY code. It would be really nice to
;; make those internal consistency checks work again and use them.
(aver-live-component component)
(do-blocks (block component)
(aver (eql (block-component block) component)))
(dolist (lambda (component-lambdas component))
;; sanity check to prevent weirdness from propagating insidiously as
;; far from its root cause as it did in bug 138: Make sure that
;; thing-to-COMPONENT links are consistent.
(aver (eql (lambda-component lambda) component))
(aver (eql (node-component (lambda-bind lambda)) component)))
(let* ((*component-being-compiled* component))
;; Record xref information before optimization. This way the
;; stored xref data reflects the real source as closely as
;; possible.
(record-component-xrefs component)
(ir1-phases component)
(when *loop-analyze*
(dfo-as-needed component)
(find-dominators component)
(loop-analyze component))
#|
(when (and *loop-analyze* *compiler-trace-output*)
(labels ((print-blocks (block)
(format *compiler-trace-output* " ~A~%" block)
(when (block-loop-next block)
(print-blocks (block-loop-next block))))
(print-loop (loop)
(format *compiler-trace-output* "loop=~A~%" loop)
(print-blocks (loop-blocks loop))
(dolist (l (loop-inferiors loop))
(print-loop l))))
(print-loop (component-outer-loop component))))
|#
;; FIXME: What is MAYBE-MUMBLE for? Do we need it any more?
(maybe-mumble "env ")
(physenv-analyze component)
(dfo-as-needed component)
(delete-if-no-entries component)
(unless (eq (block-next (component-head component))
(component-tail component))
(%compile-component component)))
(clear-constant-info)
(values))
;;;; clearing global data structures
;;;;
;;;; FIXME: Is it possible to get rid of this stuff, getting rid of
;;;; global data structures entirely when possible and consing up the
;;;; others from scratch instead of clearing and reusing them?
;;; Clear the INFO in constants in the *FREE-VARS*, etc. In
;;; addition to allowing stuff to be reclaimed, this is required for
;;; correct assignment of constant offsets, since we need to assign a
;;; new offset for each component. We don't clear the FUNCTIONAL-INFO
;;; slots, since they are used to keep track of functions across
;;; component boundaries.
(defun clear-constant-info ()
(maphash (lambda (k v)
(declare (ignore k))
(setf (leaf-info v) nil)
(setf (constant-boxed-tn v) nil))
*constants*)
(maphash (lambda (k v)
(declare (ignore k))
(when (constant-p v)
(setf (leaf-info v) nil)
(setf (constant-boxed-tn v) nil)))
*free-vars*)
(values))
;;; Blow away the REFS for all global variables, and let COMPONENT
;;; be recycled.
(defun clear-ir1-info (component)
(declare (type component component))
(labels ((blast (x)
(maphash (lambda (k v)
(declare (ignore k))
(when (leaf-p v)
(setf (leaf-refs v)
(delete-if #'here-p (leaf-refs v)))
(when (basic-var-p v)
(setf (basic-var-sets v)
(delete-if #'here-p (basic-var-sets v))))))
x))
(here-p (x)
(eq (node-component x) component)))
(blast *free-vars*)
(blast *free-funs*)
(blast *constants*))
(values))
;;;; trace output
;;; Print out some useful info about COMPONENT to STREAM.
(defun describe-component (component *standard-output*)
(declare (type component component))
(format t "~|~%;;;; component: ~S~2%" (component-name component))
(print-all-blocks component)
(values))
(defun describe-ir2-component (component *standard-output*)
(format t "~%~|~%;;;; IR2 component: ~S~2%" (component-name component))
(format t "entries:~%")
(dolist (entry (ir2-component-entries (component-info component)))
(format t "~4TL~D: ~S~:[~; [closure]~]~%"
(label-id (entry-info-offset entry))
(entry-info-name entry)
(entry-info-closure-tn entry)))
(terpri)
(pre-pack-tn-stats component *standard-output*)
(terpri)
(print-ir2-blocks component)
(terpri)
(values))
;;;; file reading
;;;;
;;;; When reading from a file, we have to keep track of some source
;;;; information. We also exploit our ability to back up for printing
;;;; the error context and for recovering from errors.
;;;;
;;;; The interface we provide to this stuff is the stream-oid
;;;; SOURCE-INFO structure. The bookkeeping is done as a side effect
;;;; of getting the next source form.
;;; A FILE-INFO structure holds all the source information for a
;;; given file.
(def!struct (file-info
(:copier nil)
#-no-ansi-print-object
(:print-object (lambda (s stream)
(print-unreadable-object (s stream :type t)
(princ (file-info-name s) stream)))))
;; If a file, the truename of the corresponding source file. If from
;; a Lisp form, :LISP. If from a stream, :STREAM.
(name (missing-arg) :type (or pathname (eql :lisp)))
;; the external format that we'll call OPEN with, if NAME is a file.
(external-format nil)
;; the defaulted, but not necessarily absolute file name (i.e. prior
;; to TRUENAME call.) Null if not a file. This is used to set
;; *COMPILE-FILE-PATHNAME*, and if absolute, is dumped in the
;; debug-info.
(untruename nil :type (or pathname null))
;; the file's write date (if relevant)
(write-date nil :type (or unsigned-byte null))
;; the source path root number of the first form in this file (i.e.
;; the total number of forms converted previously in this
;; compilation)
(source-root 0 :type unsigned-byte)
;; parallel vectors containing the forms read out of the file and
;; the file positions that reading of each form started at (i.e. the
;; end of the previous form)
(forms (make-array 10 :fill-pointer 0 :adjustable t) :type (vector t))
(positions (make-array 10 :fill-pointer 0 :adjustable t) :type (vector t)))
;;; The SOURCE-INFO structure provides a handle on all the source
;;; information for an entire compilation.
(def!struct (source-info
#-no-ansi-print-object
(:print-object (lambda (s stream)
(print-unreadable-object (s stream :type t))))
(:copier nil))
;; the UT that compilation started at
(start-time (get-universal-time) :type unsigned-byte)
;; the IRT that compilation started at
(start-real-time (get-internal-real-time) :type unsigned-byte)
;; the FILE-INFO structure for this compilation
(file-info nil :type (or file-info null))
;; the stream that we are using to read the FILE-INFO, or NIL if
;; no stream has been opened yet
(stream nil :type (or stream null))
;; if the current compilation is recursive (e.g., due to EVAL-WHEN
;; processing at compile-time), the invoking compilation's
;; source-info.
(parent nil :type (or source-info null)))
;;; Given a pathname, return a SOURCE-INFO structure.
(defun make-file-source-info (file external-format)
(make-source-info
:file-info (make-file-info :name (truename file)
:untruename (merge-pathnames file)
:external-format external-format
:write-date (file-write-date file))))
;;; Return a SOURCE-INFO to describe the incremental compilation of FORM.
(defun make-lisp-source-info (form &key parent)
(make-source-info
:file-info (make-file-info :name :lisp
:forms (vector form)
:positions '#(0))
:parent parent))
;;; Walk up the SOURCE-INFO list until we either reach a SOURCE-INFO
;;; with no parent (e.g., from a REPL evaluation) or until we reach a
;;; SOURCE-INFO whose FILE-INFO denotes a file.
(defun get-toplevelish-file-info (&optional (source-info *source-info*))
(if source-info
(do* ((sinfo source-info (source-info-parent sinfo))
(finfo (source-info-file-info sinfo)
(source-info-file-info sinfo)))
((or (not (source-info-p (source-info-parent sinfo)))
(pathnamep (file-info-name finfo)))
finfo))))
;;; Return a form read from STREAM; or for EOF use the trick,
;;; popularized by Kent Pitman, of returning STREAM itself. If an
;;; error happens, then convert it to standard abort-the-compilation
;;; error condition (possibly recording some extra location
;;; information).
(defun read-for-compile-file (stream position)
(handler-case
(read-preserving-whitespace stream nil stream)
(reader-error (condition)
(compiler-error 'input-error-in-compile-file
;; We don't need to supply :POSITION here because
;; READER-ERRORs already know their position in the file.
:condition condition
:stream stream))
;; ANSI, in its wisdom, says that READ should return END-OF-FILE
;; (and that this is not a READER-ERROR) when it encounters end of
;; file in the middle of something it's trying to read.
(end-of-file (condition)
(compiler-error 'input-error-in-compile-file
:condition condition
;; We need to supply :POSITION here because the END-OF-FILE
;; condition doesn't carry the position that the user
;; probably cares about, where the failed READ began.
:position position
:stream stream))
(error (condition)
(compiler-error 'input-error-in-compile-file
:condition condition
:position position
:stream stream))))
;;; If STREAM is present, return it, otherwise open a stream to the
;;; current file. There must be a current file.
;;;
;;; FIXME: This is probably an unnecessarily roundabout way to do
;;; things now that we process a single file in COMPILE-FILE (unlike
;;; the old CMU CL code, which accepted multiple files). Also, the old
;;; comment said
;;; When we open a new file, we also reset *PACKAGE* and policy.
;;; This gives the effect of rebinding around each file.
;;; which doesn't seem to be true now. Check to make sure that if
;;; such rebinding is necessary, it's still done somewhere.
(defun get-source-stream (info)
(declare (type source-info info))
(or (source-info-stream info)
(let* ((file-info (source-info-file-info info))
(name (file-info-name file-info))
(external-format (file-info-external-format file-info)))
(setf sb!xc:*compile-file-truename* name
sb!xc:*compile-file-pathname* (file-info-untruename file-info)
(source-info-stream info)
(open name :direction :input
:external-format external-format)))))
;;; Close the stream in INFO if it is open.
(defun close-source-info (info)
(declare (type source-info info))
(let ((stream (source-info-stream info)))
(when stream (close stream)))
(setf (source-info-stream info) nil)
(values))
;;; Loop over FORMS retrieved from INFO. Used by COMPILE-FILE and
;;; LOAD when loading from a FILE-STREAM associated with a source
;;; file.
(defmacro do-forms-from-info (((form &rest keys) info)
&body body)
(aver (symbolp form))
(once-only ((info info))
`(let ((*source-info* ,info))
(loop (destructuring-bind (,form &key ,@keys &allow-other-keys)
(let* ((file-info (source-info-file-info ,info))
(stream (get-source-stream ,info))
(pos (file-position stream))
(form (read-for-compile-file stream pos)))
(if (eq form stream) ; i.e., if EOF
(return)
(let* ((forms (file-info-forms file-info))
(current-idx (+ (fill-pointer forms)
(file-info-source-root
file-info))))
(vector-push-extend form forms)
(vector-push-extend pos (file-info-positions
file-info))
(list form :current-index current-idx))))
,@body)))))
;;; Read and compile the source file.
(defun sub-sub-compile-file (info)
(do-forms-from-info ((form current-index) info)
(with-source-paths
(find-source-paths form current-index)
(process-toplevel-form
form `(original-source-start 0 ,current-index) nil))))
;;; Return the INDEX'th source form read from INFO and the position
;;; where it was read.
(defun find-source-root (index info)
(declare (type index index) (type source-info info))
(let ((file-info (source-info-file-info info)))
(values (aref (file-info-forms file-info) index)
(aref (file-info-positions file-info) index))))
;;;; processing of top level forms
;;; This is called by top level form processing when we are ready to
;;; actually compile something. If *BLOCK-COMPILE* is T, then we still
;;; convert the form, but delay compilation, pushing the result on
;;; *TOPLEVEL-LAMBDAS* instead.
(defun convert-and-maybe-compile (form path)
(declare (list path))
(let ((*top-level-form-noted* (note-top-level-form form t)))
;; Don't bother to compile simple objects that just sit there.
(when (and form (or (symbolp form) (consp form)))
(if (fopcompilable-p form)
(let ((*fopcompile-label-counter* 0))
(fopcompile form path nil))
(with-ir1-namespace
(let ((*lexenv* (make-lexenv
:policy *policy*
:handled-conditions *handled-conditions*
:disabled-package-locks *disabled-package-locks*))
(tll (ir1-toplevel form path nil)))
(if (eq *block-compile* t)
(push tll *toplevel-lambdas*)
(compile-toplevel (list tll) nil))
nil))))))